S-Works Aethos 2 Break the Rules With a weight of just 595 grams, the S-Works Aethos 2 is the lightest production racing bike frame in the world. But that wasn't our focus at all. We broke the rules of racing because we wanted to convey pure road bike pleasure: The Aethos 2 is designed to virtually disappear beneath you – it is simply incredibly agile, smooth, and refined. Thanks to more generous tire clearance, improved components, and data-driven, fit-optimized geometry, even more riders can now enjoy this outstanding riding experience. Aethos 2 breaks the rules, out of love for the ride.